Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: src/share/classes/com/sun/tools/javac/util/Pair.java
src/share/classes/com/sun/tools/javac/util/Pair.java
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- 2eb010b6cb22
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| 1 /* | |
| 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. Oracle designates this | |
| 8 * particular file as subject to the "Classpath" exception as provided | |
| 9 * by Oracle in the LICENSE file that accompanied this code. | |
| 10 * | |
| 11 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 * accompanied this code). | |
| 16 * | |
| 17 * You should have received a copy of the GNU General Public License version | |
| 18 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 * | |
| 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 * or visit www.oracle.com if you need additional information or have any | |
| 23 * questions. | |
| 24 */ | |
| 25 | |
| 26 package com.sun.tools.javac.util; | |
| 27 | |
| 28 import java.util.Objects; | |
| 29 | |
| 30 /** A generic class for pairs. | |
| 31 * | |
| 32 * <p><b>This is NOT part of any supported API. | |
| 33 * If you write code that depends on this, you do so at your own risk. | |
| 34 * This code and its internal interfaces are subject to change or | |
| 35 * deletion without notice.</b> | |
| 36 */ | |
| 37 public class Pair<A, B> { | |
| 38 | |
| 39 public final A fst; | |
| 40 public final B snd; | |
| 41 | |
| 42 public Pair(A fst, B snd) { | |
| 43 this.fst = fst; | |
| 44 this.snd = snd; | |
| 45 } | |
| 46 | |
| 47 public String toString() { | |
| 48 return "Pair[" + fst + "," + snd + "]"; | |
| 49 } | |
| 50 | |
| 51 public boolean equals(Object other) { | |
| 52 return | |
| 53 other instanceof Pair<?,?> && | |
| 54 Objects.equals(fst, ((Pair<?,?>)other).fst) && | |
| 55 Objects.equals(snd, ((Pair<?,?>)other).snd); | |
| 56 } | |
| 57 | |
| 58 public int hashCode() { | |
| 59 if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1; | |
| 60 else if (snd == null) return fst.hashCode() + 2; | |
| 61 else return fst.hashCode() * 17 + snd.hashCode(); | |
| 62 } | |
| 63 | |
| 64 public static <A,B> Pair<A,B> of(A a, B b) { | |
| 65 return new Pair<A,B>(a,b); | |
| 66 } | |
| 67 } |
